<GridLayoutWidget>
    padding: 20
    spacing: 20
    cols: 3

    canvas:
        Color:
            rgba: [1, 1, 1, 1]
        Rectangle:
            size: self.size
            pos: self.pos

    Button:
        text: "First"

    Button:
        text: "Second"

    Button:
        text: "Third"

    Button:
        text: "Fourth"
